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CSS層疊與繼承用法手冊(cè)

本文向大家描述一下CSS層疊與繼承的用法，個(gè)元素可能同時(shí)被多個(gè)CSS選擇器選中，每個(gè)選擇器都有一些CSS規(guī)則，這就是層疊，而繼承得來(lái)的規(guī)則沒(méi)有特殊性。

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CSS層疊與繼承

一、CSS層疊

　　我們知道文檔中的一個(gè)元素可能同時(shí)被多個(gè)CSS選擇器選中，每個(gè)選擇器都有一些CSS規(guī)則，這就是層疊。這些規(guī)則有可能不矛盾的，自然這些規(guī)則將會(huì)同時(shí)起效，然而有些規(guī)則是相互沖突的，例如：

ExampleSourceCode

 
 
 
    
  
  
  
    2. 
  
  
  
  2. 
  
  
  
  3. CSSCascade title></li>
  
  
  <li><styletypestyletype="text/CSS"></li>
  
  
  <li>h1{color:Red;} </li>
  
  
  <li>bodyh1{color:Blue;} </li>
  
  
  <li> style></li>
  
  
  <li> head></li>
  
  
  <li><body></li>
  
  
  <li><h1>Hellodiv-CSS.net h1></li>
  
  
  <li> body></li>
  
  
  <li> html></li>
 
 
 </ol></pre><p> 　　為此需要為每條規(guī)則制定特殊性，當(dāng)發(fā)生沖突的時(shí)候必須選出一條最高特殊性的規(guī)則來(lái)應(yīng)用。CSS規(guī)則的特殊性可以用4個(gè)整數(shù)來(lái)表示，例如0，0，0，0.計(jì)算規(guī)則如下：</p><p>對(duì)于規(guī)則中的每個(gè)ID選擇符，特殊性加0，1，0，0</p><p>對(duì)于規(guī)則中每個(gè)類(lèi)選擇符和屬性選擇符以及偽類(lèi)，特殊性加0，0，1，0</p><p>對(duì)于規(guī)則中的每個(gè)元素名或者偽元素，特殊性加0，0，0，1</p><p>對(duì)于通配符，特殊性加0，0，0，0.</p><p>對(duì)于內(nèi)聯(lián)規(guī)則，特殊性加1，0，0，0</p><p>　　最終得到結(jié)果就是這個(gè)規(guī)則的特殊性。兩個(gè)特殊性的比較類(lèi)似字符串大小的比較，是從左往右依次比較，第一個(gè)數(shù)字大的規(guī)則的特殊性高。上例中兩條規(guī)則的特殊性分別是0，0，0，1和0,0,0,2，顯然第二條勝出，因此最終字是藍(lán)色的。</p><p>　　注意，通配符的特殊性0,0,0,0看起來(lái)沒(méi)有作用，實(shí)際上不是，還有一種沒(méi)有特殊性的規(guī)則，0，0，0，0要比沒(méi)有特殊性更特殊，下面會(huì)介紹。</p><p>　　CSS還有一個(gè)!important標(biāo)簽，用來(lái)改變CSS規(guī)則的特殊性。實(shí)際上，在解析CSS規(guī)則特殊性的時(shí)候，是將具有!important的規(guī)則和沒(méi)有此標(biāo)簽的規(guī)則利用上述方法分別計(jì)算特殊性，分別選出特殊性最高的規(guī)則。最終合并的時(shí)候，具有任何特殊性的帶有!important標(biāo)記的規(guī)則勝出。#p#</p><p><strong>二、CSS繼承</strong></p><p>　　所謂繼承，就是父元素的規(guī)則也會(huì)適用于子元素。比如給body設(shè)置為color:Red;那么他內(nèi)部的元素如果沒(méi)有其他的規(guī)則設(shè)置，也都會(huì)變成紅色。繼承得來(lái)的規(guī)則沒(méi)有特殊性。下面看一個(gè)簡(jiǎn)單的例子：</p><p>ExampleSourceCode</p><pre>
 
 
 <ol>
  
  
  <li><htmlxmlnshtmlxmlns="http://www.w3.org/1999/xhtml"></li>
  
  
  <li><head></li>
  
  
  <li><title>CSSCascade title></li>
  
  
  <li><styletypestyletype="text/CSS"></li>
  
  
  <li>*{color:Blue;} </li>
  
  
  <li>div{color:Black;} </li>
  
  
  <li>.imp{color:Red!important;} </li>
  
  
  <li>#content{color:Green;} </li>
  
  
  <li> style></li>
  
  
  <li> head></li>
  
  
  <li><body></li>
  
  
  <li><div>Hello<span>div-CSS.net span> div></li>
  
  
  <li><dividdivid="content"></li>
  
  
  <li><pclasspclass="imp">Title p></li>
  
  
  <li>ContentGoesHere. </li>
  
  
  <li> div></li>
  
  
  <li> body></li>
  
  
  <li> html></li>
  
  
  <li></li>
 
 
 </ol></pre><p> 　　注意，第一行的CSS并沒(méi)有繼承div的黑色，這是因?yàn)橥ㄅ浞木壒省Ｍㄅ浞奶厥庑噪m然是全0，但是還是比繼承的特殊性要高。第二行展示了!important標(biāo)記的作用。<br /> 　　另外，一些明顯不應(yīng)該繼承的屬性，比如border,margin,padding之類(lèi)的是不會(huì)被繼承的，具體可以參考CSS手冊(cè)。</p><p><strong>三、其他</strong></p><p>　　雖然有4個(gè)整數(shù)來(lái)表示一個(gè)特殊性，仍然有可能出現(xiàn)兩條沖突的規(guī)則的特殊性完全一致的情況，此時(shí)就按照CSS規(guī)則出現(xiàn)的順序來(lái)確定，在樣式表中最后一個(gè)出現(xiàn)的規(guī)則勝出。一般不會(huì)出現(xiàn)這樣的情況，只有一個(gè)情況例外，考慮如下樣式表：</p><p>ExampleSourceCode</p><pre>
 
 
 <ol>
  
  
  <li>:active{color:Red;} </li>
  
  
  <li>:hover{color:Blue;} </li>
  
  
  <li>:visited{color:Purple;} </li>
  
  
  <li>:link{color:Green;} </li>
  
  
  <li></li>
 
 
 </ol></pre><p>　　這樣頁(yè)面中的鏈接永遠(yuǎn)也不會(huì)顯示紅色和藍(lán)色，因?yàn)橐粋€(gè)鏈接要么被訪問(wèn)過(guò)，要么沒(méi)有被訪問(wèn)過(guò)。而這兩條規(guī)則在最后，因此總會(huì)勝出。如果改成這樣:</p><p>ExampleSourceCode</p><pre>
 
 
 <ol>
  
  
  <li>:link{color:Green;} </li>
  
  
  <li>:visited{color:Purple;} </li>
  
  
  <li>:hover{color:Blue;} </li>
  
  
  <li>:active{color:Red;} </li>
  
  
  <li></li>
 
 
 </ol></pre><p>　　就能實(shí)現(xiàn)鼠標(biāo)懸停和點(diǎn)擊的瞬間變色的效果。這樣的順序的首字母正好連成“LoVeHA”,這樣的順序被約定俗成的叫做LoveHa規(guī)則。特殊性規(guī)則從理論上講比較抽象和難懂，但在實(shí)踐中，只要樣式表是設(shè)計(jì)良好的，并不會(huì)有太多這方面的困擾，因此本文也不再做深究，更多的技術(shù)請(qǐng)參考div-CSS.net的文章更新！</p><p>文章來(lái)源:Div-CSS.net設(shè)計(jì)網(wǎng)參考:http://www.div-CSS.net/div_CSS/topic/index.asp?id=9998</p>                    <br>
                    本文標(biāo)題：CSS層疊與繼承用法手冊(cè)                    <br>
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